Jig-saw.



Patented Oct. l5, 190|. C. H. HAPGUDD.

J IG SAW.

Applxcaton led June 27,. 1901.)

s sheets-sheet l.

(No Model.)

Patented Oct. l5, |901. C. H. HAPGOGD.

. JIG SAW.

(Application Bled .Tuna 27, 1901.)

l I I Il 3 Sheets-Sheet 2;

' (No Model.)

l@ iii WIT QM par trios.

CLARENCE II. IIAPGOOD, OF DAYTON, OHIO, ASSIGNOR OF ONE-HALF TO ENOOH FRY, OF SAME PLACE.

JlGnSAW.

SPECIFICATION forming part of Letters Patent No. 684,756, dated October 15, 1901.

Application filed Tune 27,1901.

To all whom, t may concern.-

Beit known that I, CLARENCE II. HAPGOOD, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Jig-Saws; and I do declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in jig-saws.

The object of the invention is to provide a saw of the above type in which the friction incidental to the operation of the saw is reduced to the lowest minimum, so that the saw, if required, may be run by foot-power.

The object of the invention is to also provide means for holding the saw in perfect alinement, so that the cross-cut, miter, and rip work can be done with accuracy by means of gages. A

A further object of the invention is to combine means for sawing scrollwork, cross-cut, miter, and rip work in a single machine, all of which will be hereinafter more fully described.

Preceding a detail description of my invention, reference is made to the accompanying drawings, of which Figure l is a side elevation of my improved jig-saw, the table being shown in section. Fig. 2 is a top plan view of the table, the mechanism below the table appearing in dotted lines. Fig. 3 is a view of the frame and table looking in the direction of the arrow in Fig.l,the saw and saw-beams being detached. Fig. 4t is an enlarged section of the beamstand and pivots on the line @o o; of Fig. l, a portion of the beam-stand being broken out. Fig. 5 is a side elevation of the beam-stand, a portion of which is brokenrout. Fig. 6 is a sectional elevation of the forward end of the upper beam, showing the manner of its connection with the saw. Fig. 7 is a side elevation of the upper end of the beam-stand,show ing its connection with the upper beam. Fig.

Serial No. 66,265. (No model.)

S is a side elevation of the forward end of the upper beam and its saw-chuck. Fig. 9 is an elevation of the forward end of the lower beam, showing its saw-chuck and bracket or cap. Fig. l0 is an elevation of the rear end of the upper beam, showing its pivot connection with the turnbuckle. Fig. ll is a front end view of the upper beam, sawchuck, and bracket or cap. Fig. 12 is a sectional View on the line y y of Fig. 2. Fig. 13 is an elevation ofthe powertransmitting devices, showing the lower beam in section. Fig. lltis a plan View of the under side of the antifriction saw-alining devices. Fig. l5 is a section View thereof on the line fr w' of Fig. 1li. Fig. 1G is a top plan View of the same.

In a detail description of my invention similar reference characters indicate corresponding parts.

A designates a suitable upright frame having connected thereto or being an integral part thereof a rearward bracket A, which affords a support for the beam-stand B, to be again referred to. The table A has in its top side openings V and V", which form guides for gages Z and Y; also, a rectangular opening V", in which the frame O of the sawalining devices is placed. These devices will be again referred to.

E. designates a spider which supports a driving-shaft O' of iiy-wheel D, the said spider being attached to the right-hand side of th frame.

E is a crank-hanger which is connected to a foot-treadle F by a pitinan G.

H is a belt driven from the fly-wheel D and passing around a small pulley I on a countershaft J, said counter-shaft .l having a bearing in a hanger K, attached to the upper portion of the frame. Thus power is transmitted to the lower saw-beam O. The counter-shaft J;

IOO

beam O and the lower beam O are connected to the beam-standB and have their fulcrums on knife-edge pivots 29 11, the former of which projects downwardly into a V -shaped bearing q and the latter of which projects upwardly into a V-shaped bearing q. The said pivots pass through the beams and through clips P P on said beams. (See Figs. 4, 5, and 7.) The ends of said pivotsp p are tapered, so as to provide points r, which are inclosed by plates s, which are secured to the beam-stand B. The said tapering ends of said pivots form an antifriction-bearing at the center of the motion of the beams, whereby any lateral movement of said beams is prevented with the least possible friction.

S S are knife-edge pivots in the rear ends of the beams, in which position they are clamped by bolts c. The ends of said beams are slotted at c, and the screws or bolts c clamp said slotted ends in rigid contact with said knife-edge pivots. These pivots S S oscillate in V-shape bearings R R in loops which are connected by a turnbuckle R, by means of which proper adjustments of the beams are had.

d is a metal cap which is secured to the forward end of the upper beam O' to provide a bearing for the knife-edge pivot d', through which it passes.

d is a saw-chuck which has a V-shape bearingc on each side of the cap d and in which theknife-edge pivot d oscillates.

The knife-edge pivots p p are limited in any movement away from their bearings q q by blocks q, which are placed on the beamstand immediately above and below said pivots, with someintervening space, so as not to interfere with the necessary oscillations of said pivots. (See Fig. 5.)

e is a saw which has a semicircular notch e in each end which receive the screws f, which secure the en ds of the saw between the upper saw-chuck d and the lower saw-chuck h. By providing the ends of the saw with these notches e the said saw is more easily placed in a proper alinement with the chucks d and h. 'lhe lower chuck h provides an open V- shaped bearing 7L for the knife-edge pivot h'. The knife-edge of the upper pivot d projects upwardly, while the knife-edge of the pivot h projects downwardly. It will be understood that all of the knife-edge pivots of the upper beam O', with the exception of fulcrum-pivot p, project upwardly, while those of the lower beam O, with the exception of n fulcrum-pivot p', project downwardly.

-these plates has an oblong slot t" C designates the metallic frame hereinbefore referred to, which is secured to the table A within the slot V". This frame has pivoted in the opening therein a plate M, which is hinged or pivoted to said frame by means of a rod M,journaled in bosses L on the frame. t t are two sliding pieces which move in ways t on the under side of said plate M. Each of therein,

through which broad-headed screws u pass and permit of adjustments of the said plates from or toward each other. The plate M has a slot n, through which the saw e passes. The inner adjacent ends of the plates have mounted therein antifriction-rollers n',which form roller-guides to lnaintain the saw in proper alinement immediately below the surface of the table. Proper contact of the rollers n with the opposite sides of the saw is obtained by adjusting the pieces 2f, after which said plates are secured in such adjusted position by means of the screws u, as before described. The plate M is locked in position by a screw d', which passes through an opening b, which is partially within a side of the frame C and the adjacent edge 'of the plate M, as is shown iu Fig. 16. The head of this screw d is cut away at a", but the rounded portion of said head projects over the edge of the plate M when it is desired -to hold said plate in a lower position, as is shown in Figs. 14 and 16. These views show the device when it is desired to cut mitcrs, rip work, or, in fact, any work other than scrollwork. When it is desirable to perform the latter work, the plate M is unlocked by turning the screw a to bring the' straight edge d thereof in line with the adjacent edge af the plate M, after which the said plate may be turned upwardly on its hinge M', thus removing the rollers n away from the saw and allowing said saw the necessary space for scrollwork.

Referring to Fig. 2, Z designates a gage which fits in the dovetail slot V and is movable to and from a side of the saw. Z is a thumb-screw which enters a dovetail wedge Z", which lies within the dovetail slot V. By turning this thu mb-screw in one direction it releases the connection and permits of longitudinal adjustments of the gage Z, while in turning it in the opposite direction the said gage is Xed in its adj usted position. Y is another gage movable to and from the cutting edge of the saw in the dovetail slot V. The adjustment of this gage is through a thumb-screw Y', similar to the manner of adjusting and securing the gage Z.

Having described my invention, I claim- 1. In a jig-saw, the combination of upper and lower beams, a beam-stand, knife-edge pivots connecting the beams with said stand, the said pivots having the ends thereof beveled so as to avoid undue friction in checking any lateral movement of the beams, and friction-plates inclosing said beveled ends of the pivots, substantially as specified.

2. In a jig-saw, the combination of upper and lower beams, a beam-stand, knife-edge pivots connecting the beams to the beamstand, knife-edge pivots connected to the forward ends of said beams, saw-chucks having V-shaped bearings-by which they are connected to said pivots, the saw-chuck of the lower beam being open so as to admit of detachment from the beam, a saw clamped to said chucks, knife-edge pivots secured to the IOD IIO

IIS

rear ends of the beams, and a turnbuckle by means of which proper adjustments of the beams are obtained.

3. In a jig-saw, the combination of an upper and lower beam, a beamstand upon which the said beams are fulcrnmed, the said fnlcrums being knife-edge pivots, and the said pivots having their ends tapered, frictionplates secured to the beam-stand and inclosing said tapered ends of said pivots, knifeedge pivots at the rear ends of said beams, a turnbuckle connected to said pivots, knifeedge pivots at the forward end of said beams, a saw, and saw-chucks forming connections between said knife-edge pivots and said saw, all arranged substantially as specified.

4. In a jig-saw, the combination of sawbeams, a beam-stand, said beams being fulcrumed on said stand on knife-edge pivots, the f ulcrum-pivots having their ends tapered and inclosed by friction-plates whereby any undue lateral movement of the beams is checked Without undue friction, an adjusting device connecting the rear ends of the beams by knife-edge pivots secured to the forward ends of the beams, saw-chucks, each of which forms a clamp for the saw, and a V-shaped bearing for its respective knife-pivot, a saw said saw and maintaining it in proper alinement during the operation thereof.

5. In a jig-saw, the combination of the beams, three knife-edge pivots connecting said beams, the intervening pivot of each beam forming the main fulcrum of such beam, the knife-edge pivots adjacent to said fnlcrums being connected by adjusting devices for said beams, and the knife-edge pivots at the forward ends of the beams forming the saw connections of said beams, a cap or bracket secured to the forward end of the lower beam the same forming a support for the lower knife-edge pivot, and also having an oblong openingN therein, awrist-pin projected into said opening, and means connecting said Wrist-pin with the power-supplying mechanism, all arranged substantially as specified.

In testimony whereof I affix my signature in presence of two Witnesses.

CLARENCE I-I. I-IAIGOOD.

Witnesses:

R. J. MCGARTY, C. T. THEOBALD. 

